Downloading content from a list of files, handles 404 and 500 errors in CalledProcessorError

dl.py

from subprocess import *
import time
from random import randint

path = "songs.lst"
sleepaftersong = 10 #seconds sleep after each song
sleepaftermax = 600 #seconds sleep after max consecutive songs
maxdownload = 40 #Downloads before long wait

def main():
    count = 0
    url = ""
    for url in loadFiles():
        if (count > 0 and count%maxdownload == 0): #Skip waiting at 0
            time.sleep(randomtime(sleepaftermax, sleepaftermax+400))
        try :
            check_output(["wget -c  --user-agent='Mozilla/5.0 (Linux; U; Android-4.0.3; en-us; Galaxy Nexus Build/IML74K) AppleWebKit/535.7 (KHTML, like Gecko) CrMo/16.0.912.75 Mobile Safari/535.7' --content-disposition -P assets/ "+ url.rstrip("\n") ], shell=True) 
            time.sleep(randomtime(sleepaftersong, sleepaftersong+30))
        except CalledProcessError as e:
            print e
            time.sleep(randomtime(sleepaftersong, sleepaftersong+30))
        count += 1

def loadFiles():
    f = open(path, "r")
    return f

def randomtime(start, end):
    return randint(start, end)

if __name__  == "__main__":
    main()